fix(query): improve mutants coverage

Author: andogq

src/query/mod.rs

@@ -226,10 +226,30 @@ mod test {
             }],
         });
 
+        // Another single method trait with parameters.
+        hir.traits.insert(Trait {
+            name: TraitBindingId::from_id(3),
+            method_scope: ScopeId::from_id(3),
+            method_bindings: HashMap::from_iter([(
+                IdentifierBindingId::from_id(0),
+                TraitMethodId::from_id(0),
+            )]),
+            methods: indexed_vec![FunctionSignature {
+                parameters: vec![
+                    (
+                        IdentifierBindingId::from_id(2),
+                        MaybeSelfType::Type(TypeId::from_id(0))
+                    ),
+                    (IdentifierBindingId::from_id(1), MaybeSelfType::SelfType),
+                ],
+                return_ty: MaybeSelfType::Type(TypeId::from_id(0)),
+            }],
+        });
+
         // Multi method trait.
         hir.traits.insert(Trait {
-            name: TraitBindingId::from_id(1),
-            method_scope: ScopeId::from_id(1),
+            name: TraitBindingId::from_id(4),
+            method_scope: ScopeId::from_id(4),
             method_bindings: HashMap::from_iter([
                 (IdentifierBindingId::from_id(0), TraitMethodId::from_id(0)),
                 (IdentifierBindingId::from_id(1), TraitMethodId::from_id(1)),
@@ -251,7 +271,7 @@ mod test {
 
     #[rstest]
     fn all_traits(hir: Hir) {
-        assert_eq!(Query::traits().query(&hir).count(), 4);
+        assert_eq!(Query::traits().query(&hir).count(), 5);
     }
 
     #[rstest]
@@ -261,7 +281,7 @@ mod test {
                 .methods([SignatureFilter::new()])
                 .query(&hir)
                 .count(),
-            2
+            3
         );
     }
 
@@ -272,7 +292,7 @@ mod test {
                 .methods([SignatureFilter::new().return_ty(TypeId::from_id(0))])
                 .query(&hir)
                 .count(),
-            2
+            3
         );
     }